At present, it has become a trend that DVD players are gradually replaced by BD players. This trend will also extend to the field of portable CD players. At the 2011 CES show in the United States, Sony, Philips, and Samsung all launched their own portable BD players after Panasonic, which shows that this trend has taken shape. From the perspective of system solutions, this article elaborate on the design and development of portable BD players, aiming to provide a plan and some ideas for domestic counterparts to design products in the future, avoid similar problems, improve development efficiency, and improve product Quality and competitiveness.
System hardware composition
The composition of the entire system hardware is shown in Figure 1, including OPU, decoder, MCU, power and battery management, button and remote control reception, LCD driver, HDMI output, USB, network interface, and each Switch detection. The functions of each component are explained in detail below.
Figure 1 System hardware structure
OPU: Because the BD player needs to be compatible with DVD and CD, this module needs to be equipped with a laser head that can read CD / DVD / BD disc data. Currently, Sanyo, Sony and other products on the market can meet this requirement.
Decoder: The decoder of the BD player needs to be able to decode 1920 & TImes; 1080P full HD video signals, including H.264 / VC-1 / MPEG, etc. The chips of MTK and Broadcom can meet the requirements. The decoder chips listed in this article have built-in Ethernet, HDMI, ADAC and other chips, which are highly integrated. The actual selection is based on the product development needs and specific selection.
MCU: The role of MCU is very important. Because there are many functions of portable players, there is currently no single decoder chip on the market that can complete all portable functions. Therefore, a separate MCU needs to be added to assist the decoder to form the entire system and realize all the functions of the system. The MCU is responsible for handling the buttons and remote control, controlling the LCD driver chip, power management, battery charge and discharge processing, audio power amplifier, etc., and at the same time communicating with the decoder through the communication between the two parties and the transmission of information.
Battery power management: Responsible for the power management of the entire system, including power on / off, adapter / battery switching, battery charge and discharge processing, etc.
Keys and remote control: Handle the input of main body keys and remote control keys.
Switch: responsible for the detection of external switches and headphone insertion.
RTC: Real-time clock module, can be used as actual timing.
FAN: Fan, used for heat dissipation of the system; when the BD player is working, the chip operates at a higher frequency and the power consumption is larger, and an external device is needed to dissipate heat to the main chip.
Over Current ProtecTIon: This chip is used to detect and protect the USB interface overcurrent.
USB: It is used to connect external USB devices, expand the functions of the CD player, and play high-definition materials corresponding to network downloads.
Network interface: It has three functions: (1) BD live playback that meets BDA requirements; (2) Corresponding to the software network upgrade, the software of the BD player is complex, and the BD specifications are constantly updated. This function can be configured through the network after the product is launched The automatic upgrade function corresponds to market problems, meets the changing needs of the market, reduces consumer input, and improves the competitiveness of products; (3) corresponds to various network application functions.
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